{"schemaVersion":1,"slug":"microgrid-load-to-island-assignment","name":"Microgrid load-to-island assignment","kind":"symbol","abbreviation":"MLA","aliases":["Microgrid topology and earthing coordination","microgrids Microgrid topology and earthing coordination","microgrids","Microgrids","Load and bus connectivity","Load island allocation"],"category":"microgrid-systems","drawingTypes":["Schematic"],"referenceFamilies":["Manufacturer"],"summary":"Associates each selected load group with its presently connected electrical island.","description":["Associates each selected load group with its presently connected electrical island. Microgrid topology control tracks which sources and load sections are electrically connected. The same physical installation can form several islands, so source roles, measurement boundaries and earthing interfaces must follow the established configuration.","In a microgrid with sectionalized buses, the controller can associate each connected source and load group with its current island. A mode-dependent neutral or protection interface needs its own independently validated design. For this reference, the drawing identifies “Load and bus connectivity” at the input and “Load island allocation” at the output. Load measurements must use the same boundary.","Keep measured switch positions, logical island assignment and any earthing command separate. A conceptual topology block cannot establish a safe neutral-switching arrangement or prove that a circuit is de-energized. The functional block is an independent explanation of this named application. Equipment-specific ratings, terminal connections and operating conditions must be established in the project documentation."],"readingNotes":["Start at the named input: Load and bus connectivity. Identify its source device or document and the state represented on the drawing.","Follow the named output: Load island allocation. Cross-reference its destination and separate the command from confirmation that the equipment responded.","Load measurements must use the same boundary.","Keep measured switch positions, logical island assignment and any earthing command separate. A conceptual topology block cannot establish a safe neutral-switching arrangement or prove that a circuit is de-energized."],"drawingChecklist":["Label the source and connection reference for load and bus connectivity.","Identify the destination and defined state of load island allocation.","Record the equipment or control-document revision supporting this functional block.","Check this application limit in the project design: Load measurements must use the same boundary."],"distinction":"Load measurements must use the same boundary. This reference describes the named application; it does not establish a new IEC graphical symbol, an ANSI device-function number or an exact manufacturer connection diagram.","facts":[{"label":"Representation","value":"Functional block"},{"label":"Installation focus","value":"Microgrids"},{"label":"Input / boundary","value":"Load and bus connectivity"},{"label":"Output / connection","value":"Load island allocation"},{"label":"Lookup label","value":"MLA is a library lookup label, not a standard device designation."}],"references":[{"sourceId":"pi26-mg-modes","relevance":"Public technical context for microgrid topology and earthing coordination. Grid-connected and island modes, transitions, topology and authority. The application text and educational graphic are independently authored; the publisher does not certify this representation."}],"related":["microgrid-interconnection-switch","neutral-earthing-resistor","microgrid-multiple-island-control-separation"],"artwork":"pi26-microgrid-load-to-island-assignment","publishedOn":"2026-11-03","updatedOn":"2026-11-03","provenance":"independent-public-research","representation":{"type":"functional-block","focus":"microgrids","family":"microgrid-topology","input":"Load and bus connectivity","output":"Load island allocation"},"plainEnglish":{"title":"What this block does","introduction":"Associates each selected load group with its presently connected electrical island.","example":"In a microgrid with sectionalized buses, the controller can associate each connected source and load group with its current island. A mode-dependent neutral or protection interface needs its own independently validated design. For this reference, the drawing identifies “Load and bus connectivity” at the input and “Load island allocation” at the output. Load measurements must use the same boundary.","drawings":"Start at the named input: Load and bus connectivity. Identify its source device or document and the state represented on the drawing. Follow the named output: Load island allocation. Cross-reference its destination and separate the command from confirmation that the equipment responded.","terms":[{"name":"Input","meaning":"Load and bus connectivity"},{"name":"Output","meaning":"Load island allocation"},{"name":"Application reference","meaning":"An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections."}],"diagram":"flow","steps":["Load and bus connectivity","MLA","Load island allocation"],"caption":"A reading guide. The entry's original illustration and input/output facts describe this application.","sources":[{"label":"Microgrid operating modes and transitions management","url":"https://productinfo.se.com/emol_functional_specifications/doca0371_emol_functionalspecifications/EN/DOCA0371_EMOL_Functional_Specifications_DD00894746.xml/%24/EMOL_OperatingModesandTransitionsManagement_DD00895904"}],"profileId":"power-installation-microgrid-topology"},"url":"https://eloragrid.ai/symbols/microgrid-load-to-island-assignment","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/microgrid-load-to-island-assignment.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"pi26-mg-modes","publisher":"Schneider Electric","title":"Microgrid operating modes and transitions management","url":"https://productinfo.se.com/emol_functional_specifications/doca0371_emol_functionalspecifications/EN/DOCA0371_EMOL_Functional_Specifications_DD00894746.xml/%24/EMOL_OperatingModesandTransitionsManagement_DD00895904","scope":"Grid-connected and island modes, transitions, topology and authority.","type":"manufacturer","checkedOn":"2026-11-03","reuse":"link-only","relevance":"Public technical context for microgrid topology and earthing coordination. Grid-connected and island modes, transitions, topology and authority. The application text and educational graphic are independently authored; the publisher does not certify this representation."}]}